The act of travelling can be described by a number of synonyms which differ by various implications (see Notes on Synonyms, p. 18). They all describe the act of going from one place to another (that is why they are synonyms), but differ by the length of time taken by that act, by its purpose, destination or by the method of travelling.
traveln: the act of travelling, esp. a long one in distant or foreign places, either for the purpose of discovering something new or in search of pleasure and adventure. (Freq. in the plural.); е.g. He is writing a book about his travels in Africa.
journeyn: the act of going from one place to another, usually taking a rather long time; е.g. It's a three days' journey by train. You'll have to make the journey alone. Going on a journey is always exciting.
voyagen: a rather long journey, esp. by water or air; е.g. I'd love to go on a voyage, would you? The idea of an Atlantic voyage terrified her: she was sure to be seasick all the time.
tripn: a journey, an excursion, freq. a brief one, made by land or water; е.g. Did you enjoy your week-end trip to the seaside?
tourn: a journey in which a short stay is made at a number of places (usu. with the view of sightseeing), the traveller finally returning to the place from which he had started; е.g. On our Southern-England tour we visited Windsor, Oxford, Cambridge, Stratford-on-Avon and then came back to London.
cruisen [kni:z]: a sea voyage from port to port, esp. a pleasure trip; е.g. The Mediterranean cruise promised many interesting impressions.
hitch-hikingn: travelling by getting free rides in passing automobiles and walking between rides; е.g. Hitch-hiking is a comparatively new way of travelling which gives one a chance to see much without spending anything.